Crystal Structures and Magnetic Properties of Ordered Perovskites Ba2LnNbO6 (Ln=Lanthanide Elements)

Henmi, Kou; Hinatsu, Yukio; Masaki, Nobuo

doi:10.1006/jssc.1999.8460

Cited by 63 publications

(44 citation statements)

References 9 publications

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“…As observed previously in other lanthanide-containing double perovskites (15)(16)(17), the present compounds show full ordering of the Ln 3ϩ B-site ion and the nonmagnetic 5ϩ B-site ion, in this case Sb, in the available B sites, with the perfect ordering likely driven by differences in both charge and size. This is very important from the magnetic point of view, as disorder among the magnetic atoms significantly disrupts the geometrical frustration (1, 18).…”

Section: Resultssupporting

confidence: 86%

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Ba ₂ LnSbO ₆ and Sr ₂ LnSbO ₆ (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice

Karunadasa

Huang

Ueland

et al. 2003

Proc. Natl. Acad. Sci. U.S.A.

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Magnetic ground states in solids often arise as a result of a delicate balance between competing factors. One currently active area of research in magnetic materials involves compounds in which longrange magnetic ordering at low temperatures is frustrated by the geometry of the crystalline lattice, a situation known as geometrical magnetic frustration. The number of systems known to display the effects of such frustration is growing, but those that are sufficiently simple from theoretical, chemical, and physical perspectives to allow for detailed understanding remain very few. A search for model compounds in this family has led us to the double perovskites Ba 2LnSbO6 and Sr2LnSbO6 (Ln ‫؍‬ Dy, Ho, and Gd) reported here. Ba 2DySbO6, Ba2HoSbO6, Sr2DySbO6, and Sr2HoSbO6 are structurally characterized by powder neutron diffraction at ambient temperature. The trivalent lanthanides and pentavalent antimony are found to be fully ordered in the double-perovskite arrangement of alternating octahedra sharing corner oxygens. In such a structure, the lanthanide sublattice displays a classical fcc arrangement, an edge-shared network of tetrahedra known to result in geometric magnetic frustration. No magnetic ordering is observed in any of these compounds down to temperatures of 2 K, and in the case of the Dy-based compounds in particular, frustration of the magnetic ordering is clearly present. Lanthanide-based double perovskites are proposed to be excellent model systems for the detailed study of geometric magnetic frustration. D espite decades of intensive investigation of the properties of magnetic materials, relatively little is known about compounds for which the long-range magnetic ordering of strongly interacting spins at low temperatures is frustrated by their geometric arrangement in the crystal lattice. The geometries of such frustrating lattices typically are based on corner-sharing triangles. This geometry makes long-range spin ordering that strictly satisfies near-neighbor pairwise antiferromagnetic interactions impossible. The resulting compromises in the spin orientations at low temperatures result in the existence of many energetically equivalent magnetic ground states (see refs. 1-4 for a review of the field). The 2D Kagomé lattice (named after a form of Japanese basket weaving) of corner-shared triangles of magnetic ions and its 3D extension to yield a corner-shared arrangement of magnetic tetrahedra (shown in Fig. 1) are of greatest current interest. Good examples of 2D Kagomé lattice magnetic compounds are found among the Jarosites (5, 6). The frustrating properties of the corner-sharing tetrahedron lattice have been particularly well studied for the magnetic lanthanide pyrochlores. Phenomena such as the formation of ''spin ice'' in Ho 2 Ti 2 O 7 and Dy 2 Ti 2 O 7 (7-11), the magnetic analogy of the geometric frustration of the ordering of hydrogen in ice at low temperatures, and the complex applied field͞temperature magnetic-phase diagram in Gd 2 Ti 2 O 7 (12) are examples of the consequences of geometric...

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Section: Resultssupporting

confidence: 86%

“…The Ba variants can be best described by the high-symmetry cubic doubled perovskite cell, space group Fm3 m, with cell parameters (Å) (15,16). The Ba 2 LnNbO 6 family is also apparently monoclinic (17).…”

Section: Resultsmentioning

confidence: 99%

Ba ₂ LnSbO ₆ and Sr ₂ LnSbO ₆ (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice

Karunadasa

Huang

Ueland

et al. 2003

Proc. Natl. Acad. Sci. U.S.A.

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“…The fitting parameters, the isomer shift (δ), the quadrupole coupling constant (eV zz Q g ) and the asymmetry parameter (η) were determined for Ba 2 EuOsO 6 , and they are listed in Table 3. Comparable values of parameters are reported for Ba 2 EuNbO 6 [36].…”

Section: Ba 2 Euosomentioning

confidence: 50%

“…A series of perovskite-type compounds containing both rare earth and osmium Ba 2 (a) Reference (36).…”

Section: Discussionmentioning

confidence: 99%

Antiferromagnetic transitions of osmium-containing rare earth double perovskites Ba2LnOsO6 (Ln=rare earths)

Hinatsu

Doi

Wakeshima

2013

Journal of Solid State Chemistry

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The perovskite-type compounds containing both rare earth and osmium Ba 2 LnOsO 6 (Ln = Pr, Nd, Sm-Lu) have been prepared. Powder X-ray diffraction measurements and Rietveld analysis show that Ln 3+ and Os 5+ ions are structurally ordered at the M site of the perovskite BaMO 3 . Magnetic susceptibility and specific heat measurements show that an antiferromagnetic ordering of Os 5+ ions has been observed for Ba 2 LnOsO 6 (Ln = Pr, Nd, Sm, Eu, Gd, Lu) at 65-71 K. Magnetic ordering of Ln 3+ moments occurs when the temperature is furthermore decreased.3

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“…Among them A 2 FeMoO 6 (A = Ca, Sr and Ba) are known to be ferrimagnetic with critical temperatures T C (330-420 K) [3], which are higher than those of doped manganites. Many researchers [4][5][6][7] have reported the structural, magnetic and electrical properties of the double perovskite transition-metal oxides, especially for the Fe-based compounds. Recently, it has been reported that the substitution of La 3+ for Sr 2+ in Sr 2 FeMoO 6 promotes a rising of the T C and a decreasing of M S as doping level increases [8].…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of the double perovskite LaKFeMoO6 compound

Huo

Liu

Wang

et al. 2007

Journal of Alloys and Compounds

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Crystal Structures and Magnetic Properties of Ordered Perovskites Ba2LnNbO6 (Ln=Lanthanide Elements)

Cited by 63 publications

References 9 publications

Ba ₂ LnSbO ₆ and Sr ₂ LnSbO ₆ (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice

Ba ₂ LnSbO ₆ and Sr ₂ LnSbO ₆ (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice

Antiferromagnetic transitions of osmium-containing rare earth double perovskites Ba2LnOsO6 (Ln=rare earths)

Structural and magnetic properties of the double perovskite LaKFeMoO6 compound

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Crystal Structures and Magnetic Properties of Ordered Perovskites Ba2LnNbO6 (Ln=Lanthanide Elements)

Cited by 63 publications

References 9 publications

Ba 2 LnSbO 6 and Sr 2 LnSbO 6 (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice

Ba 2 LnSbO 6 and Sr 2 LnSbO 6 (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice

Antiferromagnetic transitions of osmium-containing rare earth double perovskites Ba2LnOsO6 (Ln=rare earths)

Structural and magnetic properties of the double perovskite LaKFeMoO6 compound

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Ba ₂ LnSbO ₆ and Sr ₂ LnSbO ₆ (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice

Ba ₂ LnSbO ₆ and Sr ₂ LnSbO ₆ (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice